Hi there
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Check under Settings>MIDI Devices that the Invert Crossfader toggle isn’t switched on…
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Check under Settings>Mixer>Crossfader Curve that it is set to default…shouldn’t make much of a difference but worth a try.
Is the sound still ‘full-on’ from the other deck when crossfading or is the sound ‘bleeding’ from the other deck?
If it’s ‘bleeding through’ then it could be the crossfader itself at fault. I had to get rid of my Mixtrack Platinum as I had the sound bleed issue.
Not saying that your mixer definitely has that issue but it’s one I had with that particular mixer.